Here is the full list of all 14 Monsters Den Chronicles achievements.
Complete a campaign on Veteran difficulty
Complete a campaign with a party of two
Complete a campaign with the Hardcore penalty
Complete Act V
Reach level ten with ten different characters
Take all store categories to the maximum level
Complete Act III
Reach level ten with any character
Complete Act II
Complete Act I
Win a battle against 3 or more enemies without taking damage
Pass wave 10 in Act IV
Play Act IV and pass wave 30 (above Beginner difficulty)
Complete all in-game achievements